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Population per Square Mile in Washington, by County

Population per Square Mile for every county in Washington, ranked. The highest is King County at 1,081.0 and the lowest is Garfield County at 3.3.

Washington: 117.6 · United States: n/a · median county in Washington: 38.0

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#County Population per Square Mile
1King County1,081.0
2Clark County822.5
3Kitsap County703.3
4Pierce County557.7
5Island County416.5
6Thurston County413.9
7Snohomish County404.7
8Spokane County311.2
9Benton County125.2
10Whatcom County109.3
11San Juan County106.3
12Cowlitz County98.5
13Franklin County79.7
14Skagit County75.9
15Mason County70.8
16Yakima County59.9
17Walla Walla County48.9
18Clallam County44.8
19Grays Harbor County40.5
20Grant County38.0
21Lewis County35.4
22Asotin County35.3
23Chelan County27.4
24Pacific County25.7
25Douglas County24.4
26Whitman County21.8
27Kittitas County20.5
28Stevens County19.4
29Jefferson County18.6
30Wahkiakum County17.7
31Klickitat County12.5
32Adams County10.8
33Pend Oreille County10.0
34Okanogan County8.2
35Skamania County7.5
36Lincoln County5.0
37Columbia County4.6
38Ferry County3.4
39Garfield County3.3

People divided by land area. Water is excluded, so lake and coastal counties are not unfairly diluted.

Source: ACS 2020-2024 5-Year Estimates, 2024.

Washington ranks 24th of 52 states for population per square mile.

Population per Square Mile in other states

Other statistics for Washington by county